Senior Systems Admin Engineer – TS/SCI with Poly

AT&T Global Public Sector seeks a Senior Security Engineer to manage security operations, system administration, and compliance across Linux/Windows environments and virtualization platforms. This role requires active TS/SCI clearance with polygraph and US citizenship, with onsite work in Chantilly, VA.

You will lead security tooling, patching, vulnerability remediation, and documentation efforts while mentoring junior staff and coordinating with ISSOs/ISSMs to ensure accreditation readiness.